Answer:
(a) The three observations made by Rutherford are Most of
the fast moving a ?particles passed straight through the gold foil.
(ii) Some of the a-particles were deflected by the foil by
small angles.
(iii) Very few a-particles were completely rebounded by
the gold foil.
(b) Electronic configuration =2, 8, 5
Valency =8-5 =3
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